have a read of the faq hey :D
you could use the 3k carb, it won't be ideal but it will run
tearing ALL the emissions crap off will make it run pretty badly, and you won't have the vacuum secondary carb. unless you're willing to sit down and figure out what everthing does and what you can remove or re-route or plug off, just leave it
fuel pump will be fine
yes, you can steal the double row timing gears and chain from the 3k and put them on your 5k crank and cam. very observant =)